Zoom Lens and Image Pickup Apparatus

The aspect of the disclosure relates to one or more embodiments of a zoom lens for imaging.

Zoom lenses are demanded to have a reduced size, a wide angle of view, and high optical performance. Japanese Patent Application Laid-Open No. 2022-022580 discloses a zoom lens that includes, in order from the object side to the image side, a first lens unit with positive refractive power that does not move for zooming, a plurality of lens units that move for zooming, and a rear lens unit with positive refractive power that does not move for zooming.

One or more embodiments of a zoom lens according to one or more aspects of the disclosure may include a plurality of lens units. The plurality of lens units may include, in order from an object side to an image side, a first lens unit with positive refractive power that does not move for zooming, three or more movable lens units that move for zooming, and an N-th lens unit with positive refractive power as a final lens unit. Each distance between adjacent lens units changes during zooming. The three or more movable lens units include an (N−1)-th lens unit with positive refractive power, an (N−2)-th lens unit with negative refractive power, and one or more V lens units. The first lens unit includes a focus sub-lens unit that moves for focusing. The (N−1)-th lens unit is located closer to an image plane at a telephoto end than at a wide-angle end. The N-th lens unit includes a front sub-lens unit and a rear sub-lens unit arranged in this order from the object side via a widest air gap in the N-th lens unit. The following inequalities are satisfied:

where f1 is a focal length of the first lens unit, fVi is a focal length of an i-th movable lens unit counted from the object side among the one or more V lens units, Σ(f1/fVi) is a sum of f1/fVi, β(N−1)w is a lateral magnification of the (N−1)-th lens unit at the wide-angle end, LE is a length on an optical axis of the widest air gap in the N-th lens unit, LR is a length on the optical axis from a surface closest to an object of the N-th lens unit to a surface closest to the image plane of the N-th lens unit, and Brr is a lateral magnification of the rear sub-lens unit at the wide-angle end. Alternatively, the following inequality is satisfied:

where β(N−1)w is a lateral magnification of the (N−1)-th lens unit at the wide-angle end. One or more image pickup apparatuses may include one or more zoom lenses in accordance with one or more other aspects of the disclosure.

Features of the present disclosure will become apparent from the following description of embodiments with reference to the attached drawings. The following description of embodiments is described by way of example.

A description will be given of examples according to the disclosure with reference to the drawings. First, before Examples 1 to 7 are described, matters common to each example will be described.

A zoom lens according to each example is used for a variety of image pickup apparatuses such as cinema cameras, broadcasting cameras, video cameras, surveillance cameras, digital still cameras, and film-based cameras. In a zoom lens, a lens unit is a group of one or more lenses that may or may not move as a unit during magnification variation (zooming) between the wide-angle end and the telephoto end. In other words, each distance between adjacent lens units changes during zooming. The lens unit may include an aperture stop (diaphragm). The wide-angle end and the telephoto end respectively indicate zoom states of the maximum angle of view (shortest focal length) and the minimum angle of view (longest focal length) when the lens unit that moves during zooming is located at both ends of the mechanically or controllably movable range on the optical axis.

1 3 5 7 9 11 13 FIGS.,,,,,, and respectively illustrate cross sections of zoom lenses according to Examples 1 to 7 in an in-focus state on an object at infinity (referred to as “in an in-focus state at infinity” hereinafter) at the wide-angle end. In each figure, a left side is an object side (front side) and a right side is an image side (rear side). OA indicates an optical axis of the zoom lens.

1 1 m Li is an i-th (i=1, 2, . . . ) lens unit counted from the object side, and Lis an m-th (m=1, 2, . . . ) sub-lens unit counted from the object side in the first lens unit L. A sub-lens unit is a group of one or more lenses that move or do not move integrally during focusing. SP is an aperture stop (diaphragm), and I is an image plane. An imaging surface (light receiving surface) of the image sensor in the image pickup apparatus and a film surface (photosensitive surface) of the silver film are located on the image plane I.

1 In each figure, an arrow is attached below the lens unit that moves during zooming to illustrate a moving locus (trajectory) of that lens unit during zooming from the wide-angle end to the telephoto end. An arrow labeled FOCUS is attached below the sub-lens unit of the first lens unit Lthat moves during focusing to show the moving direction of that sub-lens unit during focusing from infinity to a close distance.

1 2 4 5 The zoom lens according to each example includes a plurality of lens units. The plurality of lens units include, in order from the object side to the image side, a first lens unit Lwith positive refractive power that does not move for zooming, three or more movable lens units Lto L(or L) that move for zooming, and an N-th lens unit LN (N=5 or 6) as a final lens unit with positive refractive power that does not move for zooming. The three or more movable lens units include, in order from the image side to the object side, an (N−1)-th lens unit with positive refractive power, an (N−2)-th lens unit with negative refractive power, and one or more V lens units.

1 The first lens unit Lfurther includes a focus sub-lens unit that moves for focusing. The (N−1)-th lens unit is located closer to the image plane at the telephoto end than at the wide-angle end. The N-th lens unit includes a front sub-lens unit and a rear sub-lens unit arranged in this order from the object side to the image side via the widest air gap.

The zoom lens according to each example may satisfy at least one of the following inequalities (1) to (4):

1 where f1 is a focal length of the first lens unit L, fVi is a focal length of an i-th movable lens unit counted from the object side among the one or more V lens units, Σ is the sum of f1/fVi, β(N−1)w is a lateral magnification of the (N−1)-th lens unit at the wide-angle end, LE is a length on the optical axis with the widest air gap in the N-th lens unit, LR is a length on the optical axis from a surface closest to the object of the N-th lens unit to a surface closest to the image plane of the N-th lens unit, and Brr is a lateral magnification of the rear sub-lens unit at the wide-angle end.

1 1 Inequality (1) defines a proper relationship between the combined focal length of the first lens unit Land one or more V lens units that contribute significantly to acquiring the zoom ratio among the three or more movable lens units. Satisfying inequality (1) can achieve a refractive power arrangement that is beneficial to achieving a high zoom magnification and a reduced size and weight of the zoom lens. In a case where Σ(f1/fVi) becomes higher than the upper limit of inequality (1), the combined refractive power of the V lens unit V becomes too weak relative to the refractive power of the first lens unit L, and it becomes difficult to achieve a high zoom magnification of the zoom lens. In a case where Σ(f1/fVi) becomes lower than the lower limit of inequality (1), the combined refractive power of the V lens unit V and thus the aberration fluctuation during zooming increase, or in a case where an attempt is made to suppress the aberration fluctuation, it becomes difficult to achieve a reduced size and weight of zoom lens.

The lower limit of inequality (1) may be set to −2.0, −1.8, or −1.7, and the upper limit of inequality (1) may be set to −0.5, −0.6, or −0.65.

Inequality (2) defines a proper range of the lateral magnification of the (N−1)-th lens unit at the wide-angle end. Satisfying inequality (2) can achieve an arrangement beneficial to a high zoom magnification. In a case where β(N−1)w becomes higher than the upper limit of inequality (2), a light beam emitted from the (N−1)-th lens unit becomes closer to a parallel light beam and it becomes difficult to obtain the magnification increasing effect during zooming. In a case where β(N−1)w becomes lower than the lower limit of inequality (2), the light beam emitted from the (N−1)-th lens unit becomes more divergent, the size of the final lens unit increases, and it becomes difficult to reduce the size of the zoom lens.

The lower limit of inequality (2) may be set to 2.4, 2.6 or 2.8, and the upper limit of inequality (2) may be set to 18.0, 17.0 or 16.0.

Inequality (3) defines a proper condition under which an optical unit such as an extender can be inserted into and removed from the widest air gap in the N-th lens unit. Satisfying inequality (3) can achieve a zoom lens that allows the optical unit to be inserted and removed. In a case where LE/LR becomes higher than the upper limit of inequality (3), the gap between the front sub-lens unit and the rear sub-lens unit in the final lens unit and thus the size of the zoom lens increase. In a case where LE/LR becomes lower than the lower limit of inequality (3), sufficient space cannot be secured for inserting and removing the optical unit.

The lower limit of inequality (3) may be set to 0.31, 0.32 or 0.33, and the upper limit of inequality (3) may be set to 0.65, 0.6 or 0.55.

Inequality (4) defines a proper range of the lateral magnification of the rear sub-lens unit in the final lens unit at the wide-angle end. Satisfying inequality (4) can achieve a zoom lens that has a reduced size and weight and proper back focus. In a case where Brr becomes higher than the upper limit of inequality (4), it becomes difficult to secure the back focus. In a case where Brr becomes lower than the lower limit of inequality (4), a light ray with a large divergence angle enters the rear sub-lens unit, and the size of the final lens unit increases.

The lower limit of inequality (4) may be set to −0.65, −0.5 or −0.4, and the upper limit of inequality (4) may be set to 0.65, 0.5 or 0.4.

Satisfying the above configuration and inequalities can provide a zoom lens that has a reduced size, a wide angle of view, high optical performance, and a proper angle of light incidence on the image plane.

The zoom lens according to each example may satisfy at least one of the following inequalities (5) to (9):

1 1 In inequalities (5) to (9), β(N−1)t is a lateral magnification of the (N−1)-th lens unit at the telephoto end. bok1 is a distance on the optical axis from a surface closest to the image plane of the first lens unit Lto the rear principal point of the first lens unit, where a direction from the object side to the image side is positive. f(N−1) is a focal length of the (N−1)-th lens unit. Σ(f(N−1)/fVi) is the sum of f(N−1)/fVi. Lm is a moving amount from the object side to the image side of the lens unit with the largest negative refractive power among the one or more V lens units during zooming from the wide-angle end to the telephoto end. A moving amount of a lens unit is a difference between a position of that lens unit at the wide-angle end and a position of that lens unit at the telephoto end, and does not include a reciprocating amount, and is considered positive in a case where the lens unit is located closer to the image side at the telephoto end than at the wide-angle end. L is a length on the optical axis from a surface closest to the object of the first lens unit Lto a surface closest to the image plane of the N-th lens unit. fw is a focal length of the zoom lens at the wide-angle end.

Inequality (5) defines a proper range of a zoom ratio β(N−1)t/β(N−1)w of the (N−1)-th lens unit. In a case where the zoom ratio becomes higher than the upper limit of inequality (5), a moving amount of the (N−1)-th lens unit increases and it becomes difficult to reduce the size of the zoom lens. In a case where the zoom ratio becomes lower than the lower limit of inequality (5), the magnification is decreased in the (N−1)-th lens unit, and it becomes difficult to achieve a high zoom magnification of the zoom lens.

The lower limit of inequality (5) may be set to 1.005 or 1.01, and the upper limit of inequality (5) may be set to 1.19, 1.17, 1.15, or 1.10.

1 1 1 1 1 1 Inequality (6) defines a proper relationship between the distance on the optical axis from the surface closest to the image plane of the first lens unit Lto the rear principal point of the first lens unit Land the focal length of the first lens unit Lin order to achieve a zoom lens that has a wide angle of view and a reduced size and weight. In a case where (f1+bok1)/f1 becomes higher than the upper limit of inequality (6), the rear principal point of the first lens unit Lwill be located excessively toward the image side, the diameter of the lens disposed on the image side of the first lens unit Lincreases, and it becomes difficult to achieve a zoom lens that has a reduced size and weight. In a case where (f1+bok1)/f1 becomes lower than the lower limit of inequality (6), the focal length of the first lens unit Lincreases and it becomes difficult to achieve a wide angle of view.

The lower limit of inequality (6) may be set to 2.2, 2.3, or 2.4, and the upper limit of inequality (6) may be set to 4.5, 4.2, or 4.0.

Inequality (7) defines a proper relationship between the (N−1)-th lens unit and the combined focal length of the one or more V lens units. In a case where Σ(f(N−1)/fVi) becomes higher than the upper limit of inequality (7), the refractive power of the V lens unit, which contributes significantly to zooming, reduces, a moving amount of the V lens unit increases, and it becomes difficult to reduce the size of the zoom lens. In a case where Σ(f(N−1)/fVi) becomes lower than the lower limit of inequality (7), the refractive power of the (N−1)-th lens unit reduces, the lens diameter of the final lens unit increases, and it becomes difficult to reduce the size of the zoom lens.

The lower limit of inequality (7) may be set to −2.6, −2.4, or −2.2, and the upper limit of inequality (7) may be set to −0.8, −1.1, or −1.3.

1 Inequality (8) defines a proper relationship between the moving amount of the negative lens unit that contributes significantly to obtaining the zoom ratio among the three or more movable lens units, and the length from the surface closest to the object of the first lens unit Lto the surface closest to the image plane of the N-th lens unit. In a case where Lm/L becomes higher than the upper limit of inequality (8), the moving amount of the negative lens unit during zooming increases and it becomes difficult to reduce the size of the zoom lens. In a case where Lm/L becomes lower than the lower limit of inequality (8), the moving amount of the negative lens unit during zooming reduces and it becomes difficult to increase the zoom ratio.

The lower limit of inequality (8) may be set to 0.05, 0.1, or 0.13, and the upper limit of inequality (8) may be set to 0.25, 0.22, or 0.2.

1 1 Inequality (9) defines a proper relationship between the focal length of the first lens unit Land the focal length of the zoom lens at the wide-angle end in order to obtain a zoom lens that has a reduced size, a wide angle of view, a high zoom ratio, and high optical performance. In a case where f1/fw becomes higher than the upper limit of inequality (9), the lens diameter of the first lens unit Lincreases and it becomes difficult to obtain a zoom lens that has a reduced size. In a case where f1/fw becomes lower than the lower limit of inequality (9), it becomes difficult to obtain a zoom lens with a wide angle of view and a high magnification variation ratio, or it becomes difficult to keep the aberration at the wide-angle end within the permissible range.

The lower limit of inequality (9) may be set to 1.5, 2.0, or 2.2, and the upper limit of inequality (9) may be set to 9.0, 8.0, 6.0, or 4.0.

The zoom lens according to each example may have at least one of the following configurations.

1 11 12 13 The first lens unit Lmay include a first sub-lens unit Lwith negative refractive power that does not move for focusing and is disposed closer to the object than the focus sub-lens unit that moves for focusing, a second sub-lens unit Lwith positive refractive power as the focus sub-lens unit, and a third sub-lens unit Lwith positive refractive power that does not move for focusing and is disposed closer to the image plane than the focus sub-lens unit. This configuration is beneficial to obtaining the zoom lens that has a wider angle.

1 The first lens unit Lmay have six or more lenses. This configuration enables good aberration correction and achieves high optical performance of the zoom lens.

The (N−1)-th lens unit may move monotonously toward the image side during zooming from the wide-angle end to the telephoto end. Moving in this manner can achieve the magnification increasing effect of the (N−1)-th lens unit over the entire zoom range.

The zoom lens according to each example will be specifically described below. After Example 7, numerical examples 1 to 7 corresponding to Examples 1 to 6 will be illustrated.

1 FIG. 1 2 3 4 5 1 2 3 4 5 A zoom lens according to Example 1 (numerical example 1) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith positive refractive power, an aperture stop SP, and a fifth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, and the fourth lens unit Lconstitute the three or more movable lens units that move for zooming. The fifth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power.

12 2 3 4 5 The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance. The second lens unit Lis a variator unit (V lens unit) that moves toward the image side during zooming from the wide-angle end to the telephoto end. The third lens unit ((N−2)-th lens unit) Land the fourth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the fifth lens unit L.

2 FIG.A 2 FIG.B illustrates longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens according to numerical example 1 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberration of the zoom lens according to numerical example 1 in the in-focus state at infinity at a telephoto end.

In the spherical aberration diagram, Fno indicates the F-number. A solid line indicates a spherical aberration amount for the d-line (wavelength 587.6 nm), and an alternate long and two short dashes line indicates a spherical aberration amount for the g-line (wavelength 435.8 nm). An alternate long and short dash line indicates a spherical aberration amount for the C-line (wavelength 656.3 nm), and a broken line indicates a spherical aberration amount for the F-line (wavelength 486.1 nm). In the astigmatism diagram, a solid line S indicates an astigmatism amount on a sagittal image plane, and a broken line M indicates an astigmatism amount on a meridional image plane. The distortion diagram illustrates a distortion amount for the d-line. The chromatic aberration diagram illustrates lateral chromatic aberration amounts for the g-line, C-line, and F-line. The astigmatism diagram and chromatic aberration diagram illustrate aberration amounts in a case where a central ray of a light beam at the aperture position is a principal ray. @ is a paraxial half angle of view (°). The spherical aberration is drawn on a scale of 0.2 mm, the astigmatism is drawn on a scale of 0.2 mm, the distortion is drawn on a scale of 5%, and the chromatic aberration is drawn on a scale of 0.05 mm. The above description of the aberration diagrams also applies to the aberration diagrams of other numerical examples.

3 FIG. 1 2 3 4 5 1 2 3 4 5 A zoom lens according to Example 2 (numerical example 2) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith positive refractive power including an aperture stop SP, and a fifth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, and the fourth lens unit Lconstitute the three or more movable lens units that move for zooming. The fifth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance.

2 3 4 4 5 The second lens unit Lis a variator unit (V lens unit) that moves toward the image side during zooming from the wide-angle end to the telephoto end. The third lens unit ((N−2)-th lens unit) Land the fourth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. The aperture stop SP moves integrally with the fourth lens unit Lduring zooming. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the fifth lens unit L.

4 FIG.A 4 FIG.B illustrates longitudinal aberrations of the zoom lens according to numerical example 2 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberration of the zoom lens according to numerical example 2 in the in-focus state at infinity at a telephoto end.

5 FIG. 1 2 3 4 5 1 2 3 4 5 A zoom lens according to Example 3 (numerical example 3) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith positive refractive power including an aperture stop SP, and a fifth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, and the fourth lens unit Lconstitute the three or more movable lens units that move for zooming. The fifth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance.

2 3 4 4 5 The second lens unit Lis a variator unit (V lens unit) that moves toward the image side during zooming from the wide-angle end to the telephoto end. The third lens unit ((N−2)-th lens unit) Land the fourth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. The aperture stop SP moves integrally with the fourth lens unit Lduring zooming. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the fifth lens unit L.

6 FIG.A 6 FIG.B illustrates longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens according to numerical example 3 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberrations of the zoom lens according to numerical example 3 in the in-focus state at infinity at a telephoto end.

7 FIG. 1 2 3 4 5 6 1 2 3 4 5 6 A zoom lens according to Example 4 (numerical example 4) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith negative refractive power, a fifth lens unit Lwith positive refractive power including an aperture stop SP, and a sixth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, the fourth lens unit L, and the fifth lens unit Lconstitute the three or more movable lens units that move for zooming. The sixth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side when focusing from infinity to a close distance.

2 3 4 5 5 6 The second lens unit Land the third lens unit Lare variator units (V lens units) that move toward the image side during zooming from the wide-angle end to the telephoto end. The fourth lens unit ((N−2)-th lens unit) Land the fifth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. The aperture stop SP moves together with the fifth lens unit Lduring zooming. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the sixth lens unit L.

8 FIG.A 8 FIG.B illustrates longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens according to numerical example 4 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberrations of the zoom lens according to numerical example 4 in the in-focus state at infinity at a telephoto end.

9 FIG. 1 2 3 4 5 6 1 2 3 4 5 6 A zoom lens according to Example 5 (numerical example 5) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith negative refractive power, a fifth lens unit Lwith positive refractive power, an aperture stop SP, and a sixth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, the fourth lens unit L, and the fifth lens unit Lconstitute the three or more movable lens units that move for zooming. The sixth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance.

2 3 4 5 6 The second lens unit Land the third lens unit Lare variator units (V lens units) that move toward the image side during zooming from the wide-angle end to the telephoto end. The fourth lens unit ((N−2)-th lens unit) Land the fifth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the sixth lens unit L.

10 FIG.A 10 FIG.B illustrates longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens according to numerical example 5 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberrations of the zoom lens according to numerical example 5 in the in-focus state at infinity at a telephoto end.

11 FIG. 1 2 3 4 5 6 1 2 3 4 5 6 A zoom lens according to Example 6 (numerical example 6) illustrated inincludes, in order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith positive refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith negative refractive power, a fifth lens unit Lwith positive refractive power, an aperture stop SP, and a sixth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, the fourth lens unit L, and the fifth lens unit Lconstitute the three or more movable lens units that move for zooming. The sixth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance.

2 3 4 5 6 The second lens unit Land the third lens unit Lare variator units (V lens units) that move toward the image side during zooming from the wide-angle end to the telephoto end. The fourth lens unit ((N−2)-th lens unit) Land the fifth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air gap in the sixth lens unit L.

12 FIG.A 12 FIG.B illustrates longitudinal aberration (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens according to numerical example 6 in an in-focus state at infinity at a wide-angle end.illustrates longitudinal aberration of the zoom lens according to numerical example 6 in the in-focus state at infinity at a telephoto end.

13 FIG. 1 2 3 4 5 1 2 3 4 5 A zoom lens according to Example 7 (numerical example 7) illustrated inincludes, in this order from the object side to the image side, a first lens unit Lwith positive refractive power, a second lens unit Lwith negative refractive power, a third lens unit Lwith negative refractive power, a fourth lens unit Lwith positive refractive power, an aperture stop SP, and a fifth lens unit Lwith positive refractive power. The first lens unit Ldoes not move for zooming. The second lens unit L, the third lens unit L, and the fourth lens unit Lconstitute the three or more movable lens units that move for zooming. The fifth lens unit Lis the final lens unit (N-th lens unit) for imaging and does not move for zooming.

1 11 12 13 12 The first lens unit Lincludes, in this order from the object side to the image side, a first sub-lens unit Lwith negative refractive power, a second sub-lens unit Lwith positive refractive power, and a third sub-lens unit Lwith positive refractive power. The second sub-lens unit Lis a focus sub-lens unit that moves toward the image side during focusing from infinity to a close distance.

2 3 4 5 The second lens unit Lis a variator unit (V lens unit) that moves toward the image side during zooming from the wide-angle end to the telephoto end. The third lens unit ((N−2)-th lens unit) Land the fourth lens unit ((N−1)-th lens unit) Lmove toward the image side during zooming from the wide-angle end to the telephoto end. An optical unit such as an extender lens for focal length conversion may be inserted into the widest air space in the fifth lens unit L.

14 FIG.A 14 FIG.B illustrates longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberrations) of the zoom lens according to numerical example 7 in the in-focus state at infinity at the wide-angle end.illustrates longitudinal aberrations of the zoom lens according to numerical example 7 in the in-focus state at infinity at the telephoto end.

Numerical examples 1 to 7 will be illustrated below. In each numerical example, surface number i represents the order of the surface from the object side, r represents a radius of curvature (mm) of an i-th surface, and d represents a distance (mm) on the optical axis between i-th and (i+1)-th surfaces. (variable) of the distance d indicates a distance that changes during zooming, and a distance according to the focal length is illustrated in a separate table. nd represents an absolute refractive index at 1 atmospheric pressure for the d-line of an optical material between i-th and (i+1)-th surfaces. νd is an Abbe number of an optical material between i-th and (i+1)-th surfaces based on the d-line. The Abbe number νd based on the d-line is expressed as:

where Nd, NF, and NC are refractive indices for the d-line, F-line, and C-line, respectively.

θgF is a partial dispersion ratio of an optical material between i-th and (i+1)-th surfaces to the g-line and F-line.

The partial dispersion ratio of the g-line and F-line is expressed as:

where Ng is a refractive index for the g-line.

Each numerical example also illustrates a half angle of view) (° of the zoom lens, in addition to the focal length, F-number, and other specifications of the zoom lens. BF is the back focus, which indicates the air-equivalent distance on the optical axis from the lens surface (last surface) closest to the image plane of the zoom lens to the image surface. The overall lens length is a distance on the optical axis from the lens surface closest to the object (the frontmost surface) of a zoom lens to the final surface plus the back focus. The lens unit data indicates the focal length of each lens unit.

An asterisk “*” next to a surface number means that the surface has an aspheric shape. An aspheric shape is expressed by the following equation:

where X is a displacement amount from a surface vertex in the optical axis direction, H is a height from the optical axis in a direction orthogonal to the optical axis, a light traveling direction is positive, R is a paraxial radius of curvature, k (K in each numerical example) is a conic constant, and A3 to A16 are aspheric coefficients.

±× The “e±x” in the conic constant and aspheric coefficients means×10. WIDE represents a wide-angle end, MIDDLE represents an intermediate zoom position, and TELE represents a telephoto end.

NUMERICAL EXAMPLE 1 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 42606.96 2.15 1.8919 37.1 0.578  2 27.149 13.48  3* 58.306 1.5 1.76385 48.5 0.5589  4 36.394 14.57  5 −48.784 1.4 1.90525 35 0.5848  6 −139.348 0.2  7 179.434 6.6 1.89286 20.4 0.6393  8 −95.675 3.64  9 1043.755 7 1.59522 67.7 0.5442  10* −68.849 4.43 11 1328.657 1.7 2.00069 25.5 0.6136 12 58.203 12.4 1.497 81.5 0.5375 13 −103.477 0.21 14 −1068.202 14.28 1.43875 94.7 0.534 15 −39.902 2 1.9165 31.6 0.5911 16 −47.581 0.2 17 23517.47 8.27 1.6993 51.1 0.5552 18 −75.192 (Variable)  19* −125.330 1.2 1.6993 51.1 0.5552 20 35.256 3.86 21 −220.824 0.82 1.883 40.8 0.5667 22 25.736 5.81 1.7888 28.4 0.6009 23 −147.111 (Variable) 24 −40.955 0.85 1.53775 74.7 0.5392 25 45.6 2.1 1.85478 24.8 0.6122 26 74.105 (Variable)  27* 42.58 5.03 1.738 32.3 0.59 28 285.359 (Variable) 29 (SP) ∞ 1 30 56.171 1.3 2.0509 26.9 0.6054 31 38.832 6.45 1.53172 48.8 0.5631 32 −318.824 0.42 33 71.419 12 1.48749 70.2 0.53 34 −36.119 1.3 2.001 29.1 0.5997 35 −113.167 41.07 36 59.085 7.09 1.43875 94.7 0.534 37 −57.872 6.06 38 −83.704 1.2 2.001 29.1 0.5997 39 37.639 7.27 1.89286 20.4 0.6393 40 −75.902 0.3 41 48.469 9.55 1.43875 94.7 0.534 42 −28.911 1.71 2.001 29.1 0.5997 43 74.397 0.2 44 38.078 7.37 1.48749 70.2 0.53 45 −77.399 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = 1.84806e−05 A 6 = 1.22511e−07 A 8 = 1.72935e−09 A10 = 5.44089e−12 A12 = 3.71223e−15 A14 = 1.19089e−19 A16 = −3.17244e−23 A 3 = −5.50989e−05 A 5 = −1.04907e−06 A 7 = −1.74321e−08 A 9 = −1.16501e−10 A11 = −1.75300e−13 A13 = −4.44063e−17 A15 = 3.53356e−21 3rd Surface K = 0.00000e+00 A 4 = −1.16790e−05 A 6 = −2.08251e−07 A 8 = −1.47790e−09 A10 = −1.44163e−13 A12 = 4.86545e−15 A14 = 1.20477e−18 A 3 = 4.09795e−05 A 5 = 1.39718e−06 A 7 = 2.21440e−08 A 9 = 5.34933e−11 A11 = −9.07942e−14 A13 = −1.19736e−16 10th Surface K = 0.00000e+00 A 4 = 1.89977e−06 A 6 = −8.05631e−10 A 8 = −5.52707e−13 A 3 = 3.80032e−06 A 5 = 1.35474e−08 A 7 = 1.53113e−11 19th Surface K = 0.00000e+00 A 4 = 4.23146e−06 A 6 = −1.89360e−07 A 8 = −2.71304e−09 A10 = −1.38629e−11 A12 = −1.37448e−14 A 3 = 1.88284e−06 A 5 = 4.88427e−07 A 7 = 2.93381e−08 A 9 = 2.00605e−10 A11 = 6.65827e−13 27th Surface K = 0.00000e+00 A 4 = −2.00990e−06 A 6 = 1.28494e−08 A 8 = 1.11305e−11 A 3 = −1.12208e−06 A 5 = −9.53336e−08 A 7 = −6.19970e−10 VARIOUS DATA ZOOM RATIO 4.79 WIDE MIDDLE TELE Focal Length 11.48 29.42 55.01 Fno 2.72 2.73 3.66 Half Angle of View (°) 52.2 26.71 15.06 Image Height 14.8 14.8 14.8 Overall Lens Length 321.01 321.01 321.01 BF 42.48 42.48 42.48 d18 1.09 36.15 51.18 d23 32.77 4.24 5.29 d26 10.43 9.6 1.11 d28 16.22 10.52 2.95 d45 42.48 42.48 42.48 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 28.85 2 19 −36.48 3 24 −56.10 4 27 67.22 5 29 71.59

NUMERICAL EXAMPLE 2 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 99653.968 2.1 1.83481 42.7 0.5648  2 26.621 13.69  3* 53.277 1.5 1.804 46.5 0.5577  4 34.126 16.4  5 −49.911 1.4 1.9165 31.6 0.5911  6 −200.550 0.22  7 161.315 8.93 1.8081 22.8 0.6307  8 −83.185 1.2  9 5383.525 7.6 1.59522 67.7 0.5442  10* −71.755 3.97 11 274.397 12.93 1.497 81.5 0.5375 12 −42.730 1.7 1.95375 32.3 0.5905 13 −68.081 0.2 14 231.453 1.7 2.001 29.1 0.5997 15 50.576 14.57 1.53775 74.7 0.5392 16 −72.821 0.2 17 1767.052 6.52 1.65412 39.7 0.5737 18 −74.831 (Variable) 19 75.379 0.93 1.8515 40.8 0.5695 20 30.722 4.03 21 −362.321 0.85 1.76385 48.5 0.5589 22 20.359 6.19 1.85478 24.8 0.6122 23 −122.445 0.3 24 −87.374 0.75 2.001 29.1 0.5997 25 71.254 (Variable) 26 114.085 0.7 1.83481 42.7 0.5648 27 21.254 4.6 1.7888 28.4 0.6009 28 8996.879 1.94 29 −34.073 0.7 1.90525 35 0.5848 30 −357.713 (Variable) 31 (SP) ∞ 4.93  32* 143.199 3.59 1.51633 64.1 0.5353 33 −304.460 0.15 34 48.907 1.1 1.8919 37.1 0.578 35 37.693 5.95 1.68893 31.1 0.6004 36 −2292.893 (Variable) 37 85.702 0.98 1.963 24.1 0.6212 38 29.559 8.25 1.60311 60.6 0.5415 39 −104.561 41.06 40 79.543 7.29 1.53775 74.7 0.5392 41 −53.892 5.76 42 −78.542 1 2.001 29.1 0.5997 43 45.55 7 1.94594 18 0.6546 44 −76.212 0.2 45 45.621 8.72 1.497 81.5 0.5375 46 −37.219 1 2.0509 26.9 0.6054 47 41.356 0.2 48 29.384 12.43 1.53172 48.8 0.5631 49 −27.158 1 2.001 29.1 0.5997 50 −58.022 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = −2.49940e−06 A 6 = −4.30470e−07 A 8 = −1.39799e−09 A10 = −2.33619e−13 A12 = 2.12400e−16 A14 = −1.50597e−19 A16 = −1.63120e−23 A 3 = 2.26644e−05 A 5 = 3.11265e−06 A 7 = 3.18235e−08 A 9 = 3.38626e−11 A11 = −9.41805e−15 A13 = 2.02128e−18 A15 = 2.56180e−21 3rd Surface K = 0.00000e+00 A 4 = 7.41666e−06 A 6 = 8.87271e−07 A 8 = 9.94141e−09 A10 = −6.05462e−12 A12 = −6.58359e−14 A14 = 8.34199e−17 A16 = 2.60180e−20 A 3 = −1.78927e−05 A 5 = −4.22301e−06 A 7 = −1.18514e−07 A 9 = −4.12571e−10 A11 = 1.59628e−12 A13 = −1.09031e−17 A15 = −2.57650e−18 10th Surface K = 5.23767e−02 A 4 = 1.01819e−06 A 6 = −2.33763e−08 A 8 = −5.13972e−11 A10 = 3.03774e−13 A12 = 7.15857e−17 A14 = 9.05692e−20 A16 = 2.78191e−23 A 3 = 2.71548e−07 A 5 = 1.38358e−07 A 7 = 1.90027e−09 A 9 = −3.22019e−12 A11 = −8.94836e−15 A13 = −9.65298e−20 A15 = −3.02326e−21 32nd Surface K = 1.17920e+01 A 4 = −4.24919e−06 A 6 = −1.44582e−08 A 8 = −1.89904e−11 A 3 = 4.86489e−07 A 5 = 1.22033e−07 A 7 = 8.46187e−10 VARIOUS DATA ZOOM RATIO 4.75 WIDE MIDDLE TELE Focal Length 11.57 28.77 55 Fno 2.73 2.73 3.56 Half Angle of View (°) 51.98 27.22 15.06 Image Height 14.8 14.8 14.8 Overall Lens Length 313.08 313.08 313.08 BF 38.32 38.32 38.32 d18 1 29.97 42.38 d25 23.21 3.62 2.74 d30 12.43 10.93 1.9 d36 11.67 3.8 1.3 d50 38.32 38.32 38.32 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 27.21 2 19 −28.97 3 26 −54.58 4 31 54.45 5 37 80.65

NUMERICAL EXAMPLE 3 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 94.027 2.4 1.76385 48.5 0.5589  2 27.78 21.32  3 517.012 1.6 2.001 29.1 0.5997  4 36.378 16.17  5 −34.012 1.5 1.883 40.8 0.5667  6 −43.489 1.32  7 221.92 6.61 1.89286 20.4 0.6393  8 −129.479 9.15  9 98.501 10.65 1.618 63.3 0.5441  10* −70.521 8.43 11 −101.895 3.54 1.497 81.5 0.5375 12 −71.110 0.2 13 −68.201 1.8 1.76385 48.5 0.5589 14 −60.984 0.2 15 −68.309 1.65 1.95375 32.3 0.5905 16 63.565 10.11 1.43875 94.9 0.534 17 −52.618 0.2 18 159.07 6.14 1.76385 48.5 0.5589 19 −78.200 (Variable)  20* −858.899 1.2 1.90525 35 0.5848 21 45.413 3.85 22 −127.124 0.8 1.59522 67.7 0.5442 23 74.274 3.85 1.85478 24.8 0.6122 24 −75.499 1.01 25 −44.591 0.8 1.76385 48.5 0.5589 26 −117.809 (Variable) 27 −63.485 0.8 1.603 65.4 0.5401 28 46.687 2.21 1.85478 24.8 0.6122 29 94.896 (Variable) 30 (SP) ∞ 4.11  31* 28.292 6.16 1.58144 40.8 0.5774 32 588.133 0.2 33 67.616 1 1.76182 26.5 0.6136 34 37.713 (Variable) 35 653.952 2.82 1.56732 42.8 0.5731 36 −105.975 0.2 37 67.927 1 2.0509 26.9 0.6054 38 37.095 4.74 1.53775 74.7 0.5392 39 −4301.074 51.46 40 47.017 7.51 1.552 70.7 0.5421 41 −101.660 0.4 42 43.718 6.08 1.8081 22.8 0.6307 43 −156.796 1.1 1.883 40.8 0.5667 44 23.131 1.3 45 23.063 12.76 1.43875 94.7 0.534 46 −25.599 1.5 2.0509 26.9 0.6054 47 112.29 4.63 48 62.194 8.64 1.48749 70.2 0.53 49 −37.676 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = 3.45445e−06 A 6 = −1.27211e−09 A 8 = 3.91601e−13 A10 = 1.13301e−15 A12 = −1.39854e−18 A14 = 7.08932e−22 A16 = −1.23412e−25 10th Surface K = 0.00000e+00 A 4 = 1.15440e−06 A 6 = −3.35230e−10 A 8 = 6.56062e−14 20th Surface K = 0.00000e+00 A 4 = 1.51152e−06 A 6 = −2.45352e−09 A 8 = 3.01831e−11 A10 = −1.76333e−13 A12 = 3.53546e−16 31st Surface K = 0.00000e+00 A 4 = −6.88362e−06 A 6 = −1.52829e−09 A 8 = −5.34036e−12 VARIOUS DATA ZOOM RATIO 3.37 WIDE MIDDLE TELE Focal Length 11.89 31.51 40 Fno 2.9 2.9 3.5 Half Angle of View (°) 51.23 25.16 20.3 Image Height 14.8 14.8 14.8 Overall Lens Length 329.16 329.16 329.16 BF 37 37 37 d19 1 44.56 52.24 d26 39.3 3.58 2 d29 8.43 5.29 1 d34 10.32 5.62 3.81 d49 37 37 37 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 32.71 2 20 −46.54 3 27 −75.91 4 30 84.73 5 35 73.37

NUMERICAL EXAMPLE 4 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 10000 2.2 1.83481 42.7 0.5648  2 27.261 10.9  3* 43.746 1.55 1.8515 40.8 0.5695  4 29.78 16.94  5 −54.008 1.45 1.95375 32.3 0.5905  6 2340.232 0.2  7 126.68 7.91 1.8081 22.8 0.6307  8 −96.980 1.49  9 337.211 8.36 1.59522 67.7 0.5442  10* −58.106 2.89 11 311.073 13.21 1.43875 94.7 0.534 12 −37.563 1.6 1.95375 32.3 0.5905 13 −52.130 0.2 14 195.594 1.6 2.001 29.1 0.5997 15 53.751 14.24 1.43875 94.7 0.534 16 −56.590 0.2 17 −307.119 4.72 1.76634 35.8 0.5792 18 −68.430 (Variable) 19 67.923 0.95 1.804 46.5 0.5577 20 32.553 2.99 21 −4920.510 0.85 1.76385 48.5 0.5589 22 22.528 5.55 1.7888 28.4 0.6009 23 −75.906 (Variable) 24 −70.205 0.75 1.883 40.8 0.5667 25 50.82 (Variable) 26 −32.470 0.7 1.804 46.5 0.5577 27 29.951 2.65 1.7888 28.4 0.6009 28 433.737 (Variable) 29 (SP) ∞ 2.04 30 −8622.845 1 1.83481 42.7 0.5648 31 54.401 3.85 1.673 38.3 0.5757 32 −599.694 0.2  33* 36.239 7.96 1.57501 41.5 0.5767 34 −138.526 (Variable) 35 263.73 2.31 1.48749 70.2 0.53 36 −187.158 0.2 37 72.439 1.2 2.00069 25.5 0.6136 38 32.243 8.37 1.51823 58.9 0.5457 39 −113.669 41.34 40 74.294 7.17 1.497 81.5 0.5375 41 −55.213 0.72 42 −216.396 1.2 2.001 29.1 0.5997 43 25.638 9.15 1.89286 20.4 0.6393 44 −2098.664 0.2 45 29.296 8.3 1.673 38.3 0.5757 46 −108.576 1.58 2.001 29.1 0.5997 47 24.135 0.2 48 21.983 14.17 1.43875 94.7 0.534 49 −24.253 1 2.001 29.1 0.5997 50 −52.485 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = −4.39106e−05 A 6 = −1.26499e−06 A 8 = −3.62054e−09 A10 = −6.42274e−13 A12 = 3.92028e−16 A14 = 6.61559e−20 A16 = 7.34553e−24 A 3 = 1.49036e−04 A 5 = 1.08520e−05 A 7 = 8.69501e−08 A 9 = 8.38675e−11 A11 = −1.50177e−14 A13 = −3.97045e−18 A15 = −1.20551e−21 3rd Surface K = 0.00000e+00 A 4 = 2.70307e−05 A 6 = 9.13168e−07 A 8 = 9.74093e−09 A10 = 2.53181e−11 A12 = −1.22397e−14 A14 = 7.66186e−17 A16 = 2.34551e−20 A 3 = −9.70765e−05 A 5 = −6.69142e−06 A 7 = −1.01727e−07 A 9 = −6.68975e−10 A11 = −1.89298e−13 A13 = −6.65266e−16 A15 = −2.28044e−18 10th Surface K = 0.00000e+00 A 4 = 3.66220e−06 A 6 = 4.66240e−09 A 8 = 4.98196e−13 A 3 = −5.18478e−06 A 5 = −9.23355e−08 A 7 = −9.72622e−11 33rd Surface K = 0.00000e+00 A 4 = −7.27259e−06 A 6 = 2.24551e−09 A 8 = −2.15475e−12 VARIOUS DATA ZOOM RATIO 4.81 WIDE MIDDLE TELE Focal Length 11.44 28.81 55.02 Fno 2.73 2.73 3.66 Half Angle of View (°) 52.3 27.19 15.06 Image Height 14.8 14.8 14.8 Overall Lens Length 307.39 307.39 307.39 BF 39.12 39.12 39.12 d18 0.98 27.5 38.86 d23 1 2.87 4.26 d25 23.6 4.18 4.43 d28 11.96 10.23 2.97 d34 14.47 7.22 1.48 d50 39.12 39.12 39.12 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 26.71 2 19 −1804.98 3 24 −33.29 4 26 −36.79 5 29 55.77 6 35 70.65

NUMERICAL EXAMPLE 5 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* ∞ 2.1 1.83481 42.7 0.5648  2 25.809 14.59  3* 84.172 1.5 1.804 46.5 0.5577  4 40.603 13.67  5 −44.135 1.4 1.8919 37.1 0.578  6 −112.235 0.11  7 188.051 7.9 1.8081 22.8 0.6307  8 −76.990 1.45  9 −237.991 7.64 1.497 81.5 0.5375  10* −49.723 4.09 11 −946.175 10.96 1.48749 70.2 0.53 12 −40.594 1.75 2.001 29.1 0.5997 13 −65.641 0.21 14 282.349 1.7 2.001 29.1 0.5997 15 65.774 15.54 1.43875 94.7 0.534 16 −56.568 0.19 17 1916.533 7.65 1.76385 48.5 0.5589 18 −74.742 (Variable)  19* 205.779 1.2 1.83481 42.7 0.5648 20 27.352 4.21 21 −167.761 0.82 1.83481 42.7 0.5648 22 22.203 6.79 1.7888 28.4 0.6009 23 −63.011 (Variable) 24 −32.050 0.82 1.883 40.8 0.5667 25 −84.151 (Variable) 26 −39.149 0.85 1.59522 67.7 0.5442 27 62.164 2.31 1.85478 24.8 0.6122 28 157.587 (Variable)  29* 52.222 4.12 1.8515 40.8 0.5695 30 −199.701 (Variable) 31 (SP) ∞ 1.8 32 39.995 6.88 1.51742 52.4 0.5564 33 −146.845 0.23 34 279.585 1 2.001 29.1 0.5997 35 33.798 6.4 1.51633 64.1 0.5353 36 −160.634 0.43 37 −368.954 5.64 1.6727 32.1 0.5988 38 −30.284 1 2.001 29.1 0.5997 39 −80.389 41.4 40 93.888 5.18 1.43875 94.7 0.534 41 −60.517 0.7 42 57.562 7.87 1.80809 22.7 0.6306 43 −35.852 1.1 1.8919 37.1 0.578 44 34.242 0.82 45 31.872 13.49 1.43875 94.7 0.534 46 −23.478 1.1 2.001 29.1 0.5997 47 171.178 0.13 48 52.667 8.91 1.48749 70.2 0.53 49 −35.296 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = 2.01487e−05 A 6 = 2.48992e−08 A 8 = 2.17115e−11 A10 = −1.96498e−13 A12 = −1.74230e−16 A14 = −3.30200e−19 A16 = −4.27190e−23 A 3 = −4.92267e−05 A 5 = −8.40544e−07 A 7 = −9.83600e−10 A 9 = 2.28192e−12 A11 = 6.34512e−15 A13 = 8.73990e−18 A15 = 6.07222e−21 3rd Surface K = 0.00000e+00 A 4 = −1.79865e−05 A 6 = 1.08737e−07 A 8 = 2.67194e−09 A10 = −2.65927e−10 A12 = −1.84184e−12 A14 = −1.97641e−15 A16 = −1.90543e−19 A 3 = 4.04572e−05 A 5 = 1.49144e−06 A 7 = −5.30553e−08 A 9 = 1.16096e−09 A11 = 2.84179e−11 A13 = 7.62209e−14 A15 = 2.93416e−17 10th Surface K = 0.00000e+00 A 4 = −2.18415e−06 A 6 = −2.03336e−07 A 8 = −1.52986e−09 A10 = 5.10495e−12 A12 = 2.25271e−14 A14 = 9.63941e−19 A16 = −1.87371e−21 A 3 = 9.29120e−06 A 5 = 1.14812e−06 A 7 = 2.31796e−08 A 9 = 2.52009e−11 A11 = −5.09518e−13 A13 = −4.71919e−16 A15 = 1.41597e−19 19th Surface K = 0.00000e+00 A 4 = 5.62296e−06 A 6 = 9.66460e−07 A 8 = 6.14358e−08 A10 = −8.91142e−10 A12 = −2.54378e−11 A14 = −7.20136e−14 A16 = −1.75328e−17 A 3 = −3.52425e−07 A 5 = −1.20759e−06 A 7 = −3.48990e−07 A 9 = −3.12076e−09 A11 = 2.23374e−10 A13 = 1.72991e−12 A15 = 1.70114e−15 29th Surface K = 0.00000e+00 A 4 = −8.28442e−06 A 6 = −4.71556e−07 A 8 = −5.90301e−09 A10 = 3.62432e−12 A12 = 6.58822e−14 A14 = 8.73138e−17 A16 = −5.58289e−21 A 3 = 3.07013e−06 A 5 = 1.82756e−06 A 7 = 7.02954e−08 A 9 = 2.30046e−10 A11 = −9.68540e−13 A13 = −3.02124e−15 A15 = −9.83633e−19 VARIOUS DATA ZOOM RATIO 5.45 WIDE MIDDLE TELE Focal Length 10.99 29.91 59.97 Fno 2.99 3 4 Half Angle of View (°) 53.39 26.33 13.86 Image Height 14.8 14.8 14.8 Overall Lens Length 320.99 320.99 320.99 BF 43.15 43.15 43.15 d18 1.26 36.15 51.1 d23 5.7 1.47 3.38 d25 28.22 4.92 3.83 d28 3.82 6.42 0.35 d30 21.2 11.23 1.52 d49 43.15 43.15 43.15 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 27.6 2 19 −53.93 3 24 −59.06 4 26 −60.47 5 29 48.98 6 31 74.85

NUMERICAL EXAMPLE 6 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 99721.237 2.1 1.883 40.8 0.5667  2 25.124 15.63  3* 68.6 1.5 1.816 46.6 0.5568  4 33.546 14.38  5 −45.317 1.4 1.8919 37.1 0.578  6 −178.717 0.11  7 147.96 9.19 1.8081 22.8 0.6307  8 −69.637 3.61  9 −409.774 8.82 1.497 81.5 0.5375  10* −47.650 4.23 11 −210.917 8.86 1.497 81.5 0.5375 12 −39.439 1.75 2.001 29.1 0.5997 13 −77.835 0.21 14 325.247 1.7 2.001 29.1 0.5997 15 63.632 12.38 1.497 81.5 0.5375 16 −88.789 0.19 17 ∞ 8.47 1.76385 48.5 0.5589 18 −64.157 (Variable) 19 −402.768 4 1.54814 45.8 0.5686 20 −125.167 (Variable)  21* 203.099 1.2 1.76385 48.5 0.5589 22 32.045 3.78 23 −462.841 0.82 1.883 40.8 0.5667 24 21.939 7.59 1.7888 28.4 0.6009 25 −111.087 1.86 26 −33.589 0.82 1.804 46.5 0.5577 27 −62.504 (Variable) 28 −39.248 0.85 1.59522 67.7 0.5442 29 67.288 2.27 1.85478 24.8 0.6122 30 134.04 (Variable)  31* 50.024 4.32 1.90525 35 0.5848 32 −1067.543 (Variable) 33 (SP) ∞ 1.83 34 48.986 7.26 1.51633 64.1 0.5353 35 −95.477 0.23 36 300.241 1 2.001 29.1 0.5997 37 35.947 4.01 1.48749 70.2 0.53 38 133.716 0.93 39 138.48 7.51 1.6727 32.1 0.5988 40 −29.019 1 2.001 29.1 0.5997 41 −75.084 34.89 42 90.109 8.59 1.43875 94.7 0.534 43 −53.209 1.19 44 53.058 6.86 1.8081 22.8 0.6307 45 −50.597 1.1 1.95375 32.3 0.5905 46 31.506 0.92 47 30.981 16.09 1.43875 94.7 0.534 48 −21.647 1.1 1.90525 35 0.5848 49 303.67 0.16 50 71.622 9.78 1.48749 70.2 0.53 51 −31.057 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = 2.00578e−05 A 6 = −3.49834e−08 A 8 = −1.97814e−10 A10 = −3.18166e−13 A12 = −2.34430e−16 A14 = −3.94878e−19 A16 = −4.94966e−23 A 3 = −2.69692e−05 A 5 = −4.49193e−07 A 7 = 3.63294e−09 A 9 = 8.84344e−12 A11 = 8.19638e−15 A13 = 1.11763e−17 A15 = 7.06579e−21 3rd Surface K = 0.00000e+00 A 4 = −1.88837e−05 A 6 = 1.14408e−08 A 8 = 1.30608e−09 A10 = −2.67806e−10 A12 = −1.84918e−12 A14 = −1.97831e−15 A16 = −1.87551e−19 A 3 = 2.30237e−05 A 5 = 1.83049e−06 A 7 = −3.77502e−08 A 9 = 1.22832e−09 A11 = 2.85063e−11 A13 = 7.65091e−14 A15 = 2.91882e−17 10th Surface K = 0.00000e+00 A 4 = −9.99055e−07 A 6 = −1.14112e−07 A 8 = −8.45719e−10 A10 = 4.38289e−12 A12 = 2.18286e−14 A14 = 2.74189e−18 A16 = −2.08352e−21 A 3 = 4.92584e−06 A 5 = 6.85638e−07 A 7 = 1.27647e−08 A 9 = 8.15011e−12 A11 = −4.50105e−13 A13 = −5.24524e−16 A15 = 1.33374e−19 21st Surface K = 0.00000e+00 A 4 = 5.11270e−06 A 6 = 1.27488e−06 A 8 = 6.91406e−08 A10 = −9.64538e−10 A12 = −2.50957e−11 A14 = −6.51372e−14 A16 = −1.40914e−17 A 3 = −7.60726e−07 A 5 = −1.89147e−06 A 7 = −4.19029e−07 A 9 = −3.20858e−09 A11 = 2.29422e−10 A13 = 1.63798e−12 A15 = 1.45855e−15 31st Surface K = 0.00000e+00 A 4 = −7.29704e−06 A 6 = −3.62499e−07 A 8 = −3.90225e−09 A10 = 2.84575e−11 A12 = 1.00025e−13 A14 = 4.24406e−17 A16 = 2.35975e−20 A 3 = 3.87591e−06 A 5 = 1.44823e−06 A 7 = 5.36549e−08 A 9 = −1.70348e−11 A11 = −2.45064e−12 A13 = −2.20859e−15 A15 = −1.34738e−18 VARIOUS DATA ZOOM RATIO 3.88 WIDE MIDDLE TELE Focal Length 10.3 24.06 39.99 Fno 2.72 2.73 3.12 Half Angle of View (°) 55.16 31.6 20.31 Image Height 14.8 14.8 14.8 Overall Lens Length 321 321 321 BF 43.19 43.19 43.19 d18 0.19 2.23 3 d20 0.99 29.75 42.18 d27 27.9 4.02 3.54 d30 4.94 5.49 0.37 d32 17.3 9.83 2.23 d51 43.19 43.19 43.19 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 32.36 2 19 329.63 3 21 −31.69 4 28 −56.20 5 31 52.88 6 33 72.84

NUMERICAL EXAMPLE 7 UNIT: mm SURFACE DATA Surface No. r d nd νd θgF  1* 107.128 2.15 1.883 40.8 0.5667  2 26.58 27.77  3* −59.702 1.4 2.001 29.1 0.5997  4 349.036 0.2  5 208.619 5.83 1.89286 20.4 0.6393  6 −99.748 4.85  7 725.707 7 1.59522 67.7 0.5442  8* −71.098 4.61  9 159.628 1.7 2.001 29.1 0.5997 10 54.415 12.1 1.497 81.5 0.5375 11 −225.042 0.21 12 −491.474 5.03 1.43875 94.7 0.534 13 −73.242 2 1.84666 23.8 0.6205 14 −89.709 0.2 15 −147.905 4 1.83481 42.7 0.5648 16 −91.410 0.2 17 206.052 9.18 1.51823 58.9 0.5457 18 −65.422 (Variable)  19* −77.250 1.2 1.8919 37.1 0.578 20 35.027 3.32 21 −77.045 0.82 1.883 40.8 0.5667 22 33.725 3.26 1.89286 20.4 0.6393 23 −226.080 (Variable) 24 −31.283 0.85 1.497 81.5 0.5375 25 139.894 1.81 1.85478 24.8 0.6122 26 828.336 (Variable)  27* 62.698 8 1.883 40.8 0.5667 28 −105.639 (Variable) 29 (SP) ∞ 1 30 109.543 1.3 1.90525 35 0.5848 31 47.934 9.55 1.59522 67.7 0.5442 32 −61.090 0.18 33 261.961 12 1.53775 74.7 0.5392 34 −34.275 1.3 1.95375 32.3 0.5905 35 −167.219 41.07 36 91.628 7.88 1.43875 94.7 0.534 37 −46.727 6.6 38 −145.495 1.2 2.001 29.1 0.5997 39 38.218 7.9 1.89286 20.4 0.6393 40 −89.460 0.3 41 187.115 8.77 1.43875 94.7 0.534 42 −24.905 1.71 2.001 29.1 0.5997 43 170.253 0.2 44 47.864 8.27 1.497 81.5 0.5375 45 −54.028 (Variable) Image Plane ∞ ASPHERIC DATA 1st Surface K = 0.00000e+00 A 4 = −2.45588e−05 A 6 = −3.67611e−07 A 8 = 6.50001e−10 A10 = 5.55148e−12 A12 = 3.66117e−15 A14 = 1.47893e−19 A16 = −1.11709e−23 A 3 = 6.62720e−05 A 5 = 4.37863e−06 A 7 = 1.22001e−08 A 9 = −9.83386e−11 A11 = −1.82674e−13 A13 = −4.07328e−17 A15 = 1.37079e−21 3rd Surface K = 0.00000e+00 A 4 = 1.95095e−05 A 6 = 1.65172e−07 A 8 = 1.89745e−10 A10 = 1.56723e−14 A 3 = −7.26428e−05 A 5 = −2.34782e−06 A 7 = −7.20838e−09 A 9 = −2.68491e−12 8th Surface K = 0.00000e+00 A 4 = 1.08200e−05 A 6 = 3.36226e−08 A 8 = 5.96039e−12 A 3 = −4.57021e−05 A 5 = −7.80316e−07 A 7 = −7.25175e−10 19th Surface K = 0.00000e+00 A 4 = −5.99251e−06 A 6 = −6.71902e−06 A 8 = −3.40305e−07 A10 = −2.73122e−09 A12 = −1.98857e−12 A 3 = 2.84076e−06 A 5 = 1.34577e−05 A 7 = 1.91719e−06 A 9 = 3.85362e−08 A11 = 1.11133e−10 27th Surface K = 0.00000e+00 A 4 = −3.31332e−06 A 6 = 1.31899e−08 A 8 = 1.05154e−11 A 3 = −5.09297e−07 A 5 = −8.77617e−08 A 7 = −5.90945e−10 VARIOUS DATA ZOOM RATIO 3.70 WIDE MIDDLE TELE Focal Length 13.2 30.03 48.78 Fno 2.73 2.73 3.07 Half Angle of View (°) 48.27 26.23 16.88 Image Height 14.8 14.8 14.8 Overall Lens Length 312.44 312.44 312.44 BF 40 40 40 d18 1.52 31.94 44.97 d23 37.3 10.62 3.97 d26 0 5.7 5.01 d28 16.7 7.27 1.58 d45 40 40 40 LENS UNIT DATA Lens Unit Starting Surface Focal Length 1 1 35.51 2 19 −22.26 3 24 −69.63 4 27 45.58 5 29 79.29

Table 1 summarizes values of inequalities (1) to (9) in numerical examples 1 to 7. The zoom lens according to each numerical example satisfy all of inequalities (1) to (9).

TABLE 1 Numerical Example 1 2 3 4 5 6 7 Inequality (1) f1/fv −0.79 −0.94 −0.70 −0.82 −0.98 −0.92 −1.60 (2) β(N − 1)w 3.3 14.8 3 5.4 4.6 4.2 6.6 (3) LE/LR 0.4 0.43 0.49 0.43 0.4 0.34 0.38 (4) βrr 0.3 0.32 0.24 0.38 0.38 0.28 0.38 (5) β(N − 1)t/β(N − 1)w 1.06 1.013 1.026 1.043 1.087 1.067 1.05 (6) (f1 + bok1)/f1 3.2 3 3.5 3 3.2 3.9 2.5 (7) f(N − 1)fV −1.8 −1.9 −1.8 −1.7 −1.7 −1.5 −2.0 (8) Lm/L 0.18 0.15 0.18 0.15 0.18 0.16 0.16 (9) f1/fw 2.51 2.35 2.75 2.34 2.51 3.14 2.69 f1 28.85 27.21 32.71 26.71 27.6 32.36 33.51 fv −36.48 −28.97 −46.54 −32.69 −28.19 −35.06 −22.26 β(N − 1)w 3.31 14.81 3 5.37 4.64 4.22 6.63 LE 41.07 41.06 51.46 41.34 41.4 34.89 41.07 LR 103.3 94.88 104.15 97.12 102.27 102.63 108.22 βrr 0.3 0.32 0.24 0.38 0.38 0.28 0.38 β(N − 1)t 3.51 15 3.08 5.6 5.04 4.51 6.96 bok1 64.87 54.23 81.14 52.76 61.87 92.71 53.26 f(N − 1) 67.22 54.45 84.73 55.77 48.98 52.88 45.58 Lm 50.087 41.384 51.241 41.142 49.844 44.001 43.447 L 278.52 274.76 292.16 268.27 277.83 277.82 272.44 fw 11.479 11.57 11.886 11.438 10.995 10.3 13.2 fv1 −36.48 −29.03 51.46 −1804.98 −53.93 329.63 −22.26 fv2 — — — −33.29 −59.06 −31.69 —

15 FIG. 15 FIG. 101 124 125 101 124 101 124 101 124 schematically illustrates an image pickup apparatus including any one of the zoom lenses according to Examples 1 to 7 as an imaging optical system. In, reference numeraldenotes one of the zoom lenses according to Examples 1 to 7. Reference numeraldenotes a camera body. Reference numeraldenotes an image pickup apparatus configured by mounting the zoom lensto the camera body. The zoom lensis attachable to and detachable from the camera body. However, the zoom lensmay be integrated with the camera body.

101 1 2 125 1 2 1 2 101 The zoom lensincludes, in order from the object side to the image side, a first lens unit F, a zoom unit LZ, and an imaging lens unit R. The first lens unit F includes a focus (lens) unit that moves during focusing. The zoom unit LZ includes at least three or more (moving) lens units. An aperture stop SP, a lens unit R, and a lens unit Rare disposed on the image side of the zoom unit LZ. The image pickup apparatusfurther includes an optical unit IE that can be inserted into and removed from the optical path between the lens units Rand R. Inserting the optical unit IE into space between the lens units Rand Rcan change the focal length range of the zoom lens.

114 115 116 118 114 115 119 121 Reference numeralsanddenote drive mechanisms configured to move the first lens unit F and the lens units included in the zoom unit LZ along the optical axis. Reference numeralstodenote motors configured to drive the drive mechanismsandand the aperture stop SP, respectively. Reference numeraltodenote detectors configured to detect the position of the first lens unit F on the optical axis and the position of the lens units included in the zoom unit LZ, and detect the aperture diameter of the aperture stop SP, respectively.

124 109 110 101 101 110 111 122 124 101 In the camera body, reference numeraldenotes a glass block such as an optical filter, and reference numeraldenotes an image sensor configured to capture an object image formed by the zoom lens(i.e., image the object through the zoom lens). The image sensorincludes a photoelectric conversion element such as a CCD sensor, a CMOS sensor, etc. Reference numeralsanddenote a camera CPU serving as a processing unit in the camera bodyand a lens CPU serving as a processing unit in the zoom lens, respectively.

While the present disclosure has been described with reference to embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Each example according to the disclosure can provide a zoom lens that has a reduced size, a wide angle of view, and a high zoom magnification.

This application claims the benefit of Japanese Patent Application No. 2024-190407, which was filed on Oct. 30, 2024, and which is hereby incorporated by reference herein in its entirety.